feat: configure types of integers fields when initializing Point from dict structure

[bednar]

Closes #516

Proposed Changes

The users can specify integer types by:

# Use custom dictionary structure
dict_structure = {
    "measurement": "h2o_feet",
    "tags": {"location": "coyote_creek"},
    "fields": {
        "water_level": 1.0,
        "some_counter": 108913123234
    },
    "time": 1
}

point = Point.from_dict(dict_structure, field_types={"some_counter": "uint"})

Documentation:

Checklist

• CHANGELOG.md updated
• Rebased/mergeable
• A test has been added if appropriate
• pytest tests completes successfully
• Commit messages are conventional
• Sign CLA (if not already signed)